The Last Working MOST ID of Node parameters help you determine the order in which modules or “nodes” are connected in the MOST ring. The Radio will typically be Node 1. All other modules can be arranged differently depending on the vehicle and the vehicle’s options. In the example shown here, Node 1 is the Radio, Node 2 is the HMI Module, Node 3 is the Instrument Cluster, Node 4 is the Amplifier, and Node 5 is the CD player.